Help with CCS stack

yy · Joined: 22 Aug 2010 Posts: 4

Hello,
I use the 3.3v Ethernet Controller kit. I've used the CCS stack in order to send udp messages over a network. At this point Ive decided to make the device ask an IP address based on a udp message it got from a pc App I wrote this feature workd fine with our linksys router but when i've truied another router (edimax) the data arrived perfectly to the device but it never gets the requested IP.
can anybody suggest the basic steps needed in order to implement such feature using the CCS stack?
I use pic18F67j60 CCS ver. 4.108

collink · Joined: 08 Jan 2010 Posts: 137 Location: Michigan

bkamen · Posted: Sun Aug 22, 2010 9:06 am

You need to give us better network configuration for this.

Are you saying you want to talk to a device that's connected like this?

PIC -> Local Router-> Internet -> Remote Router -> PC?

If both of the networks behind the routers are private IP's (RFC1918), it will never work unless you have some form of DMZ or mapped IP address set up on the remote router. And then you'll never see the PC's address as it's private and has no route.

You would talk to the Remote Router at the desired port number and just get answers back back from the PC on behalf of the Remote Router

I'm just guessing. We need to know more about your network configuration.

-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D

yy · Joined: 22 Aug 2010 Posts: 4

My network configuration is very simple:
PIC -> Local Router-> PC
This is what's strange, it is a simple configuration so changing a router shouldn't have such an effect, and as I said all I want is the pic to ask and get a specific ip.

bkamen · Posted: Sun Aug 22, 2010 1:54 pm

So the PC is on the other side of the router or the PC is on the same side of the router as the PIC?

If the case is the former, then I would still ask, what are the IP addresses of all the items in question (no RFC1918 ip's)? Is the router a firewall running NAT?

If it's the latter, then the PIC should be contacting the PC directly via an ARP request... the router shouldn't be getting involved at all.

-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D

yy · Joined: 22 Aug 2010 Posts: 4

As I see it ARP helps to find the address, but nothing more.
I've tried using the ARP Command from command line but it didn't work.

bkamen · Posted: Mon Aug 23, 2010 8:34 am

DHCP can be a problem because a lot of cheaper routers take shortcuts implementing it.

If the PIC isn't getting an address (and is set to do so) --- it won't talk on the network until it gets one.

Try turning off DHCP on the PIC and assigning a static address and then see if your application works.

-Ben
_________________
Dazed and confused? I don't think so. Just "plain lost" will do. :D

yy · Joined: 22 Aug 2010 Posts: 4

giving it static IP works fine but putting that same IP in DHCPRequest message doesn't work.
I've tryid conncecting only my PC and the pic to the router and yet couldn't get a specific ip

bkamen · Posted: Mon Aug 23, 2010 11:43 pm